Pressure-reducing valve



( 2 Sheets-Sheet 1. G. M. DAVIS.

PRES-SURE REDUCING VALVE. No. 339,866 Patented Apr. 13, 1886.

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PRESSU'RBREDUGING VALVE.

No. 339,865. Patented Apr. 13, 1886.

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UNITED STATES PATENT CEFICE.

GEORGE M. DAVIS, OF CHICAGO, ILLINOIS.

PRESSURE-REDUCING VALQVE.

vJL"$21CIl-ILKLQJE'ION forming part of Letters Patent No. 339,865, dated April 13, 1886.

Application filed January 26, 1886. Serial No. 189,780. (No model.)

To all whom it may concern.-

Be it known that I, GEORGE M. DAVIS, of Chicago, county of Gook,and State of Illinois, have invented certain new and useful Improve ments in a Pressure-Reducing Valve, of which the following is a full, clear, and exact description, that will enable others to make and use the same, reference being had to the accompanying drawings, forming a part of this specification.

This invention relates to an improvement in that class of valves which are intended to be placed in the main or branch servicepipes leading from the boiler or other steam-generator, whereby a lower pressure than that generated in the boiler may be secured and automatically maintained, no matter what the excess of pressure may be in the steam-s lpply apparatus, the object being to provide a device that will automatically regulate and maintain the steam-pressure at any desired limit below the boiler-pressu re, so that a different pressure for different purposes may be obtained and distributed from the same source of supply.

The device employed to accomplish the desired result consists of certain novel features in the construction, arrangement, and operation of the several parts, as will be hereinafter set forth in detail.

Figure 1 is a side elevation of a device embodying my improved features; Fig. 2, a vertical section; Fig. 3, a plan view; Fig. 4, a sectional detail; Fig. 5, a broken-away side elevation of the steam-piston. Fig. 6 is an elevation of the device, showing different means employed for weighting the valve from that illustrated in Figs. 1 and 2; Fig. 7, a side elevation of the same, looking in the direction indicated by the arrows; and Fig. 8 a vertical section showing a cylindrical valve substituted for the wing-valve illustrated in Fig. 2.

Referring to the drawings,A represents the globular body inclosing the valve chamber and provided with the receiving-inlet A and the discharge-outlet A. The lower end of the steam-cylinder B is insert-ed in the upper side of the valve-body, while the upper end is closed by the hollow or tubular cap B, which has a threaded connection with said cylinder, as shown in Fig. 2. The lower inside end of this cap is somewhat contracted, and is threaded for the reception of the correspondinglythreaded drop-tube a, extending down on the inside of the tubular piston O. The diameter of the tube a is less than that of the piston, thus providing the annular space or passage a between the adjacent surfaces. The tubular piston O is provided on the exterior surface with the annular groove or grooves a, (see Figs. 2, 4, and 5,) which may consist of one or more, as practical working may require. Ordinarily, the piston will be constructed with a number of grooves alternating, as shown in Fig. 5. These grooves form water-pockets, providing a water -packing to prevent the steam from escaping up between the contacting surfaces of the piston and cylinder, the pockets being gradually filled with water by condensation when steam is admitted to the valve-chamber. The water that is forced out at the upper end of the piston from tinieto time by the pressurc on the lower end follows down the passage to, between the tube a and the interior of the piston, and then up through said tube into the cap B, and finally escapes through the waste or drip pipe a leading from the upper part of said cap, as shown in Figs. 1 and 2. This arrangement, as it will be readily ob served, prevents a back-pressure from forming, and at the same time provides so gradual an escape for the product of condensation as to at all times insure a perfectly tight joint between the frictional wcaring-surfaces of the cylinder and piston. The Water-packing also has the effect of lessening the friction of these surfaces over that of the ordinary packing, thus insuring a sensitive action of the valve and causing it to respond to the slightest variation of the pressure. The tubular piston C is provided with the interiorly-arranged diaphragm a, in the under side of which is inserted the socket-plug b. The upper end of the connecting-link O is pivoted in said socket, (see Fig. 2,) the lower end being pivoted to the upper end of the valve D, inserted in the inlet-passage of the valve-chamber. This arrangement of connecting the piston and valve by means of a link having a pivotal bearing at each end prevents all possibility of the parts binding, as it leaves the valve and piston free to have a lateral adjustment independent of the other, which would not be possible if the connection were rigid. The upper side of the diaphragm a is provided with a conical recess for the reception of the lower conical end of the loosely-arranged stem D. This stem projects up through a central opening in the cap B, and loosely supports the yoke D provided with the socket-bearing b, in the position shown in Figs. 1 and 2. The yoke 1). consists of a horizontal bar and two vertical bars extending at right angles therefrom, the lower ends of which are turned outward to form the hook ends I) b for the support of the adjusting-weights D The weights in this case are of a circular form, but may be of any other construction, and are cut out in the cenfrom or replaced on the yoke, and at the same time always remain in a central position and.

equally balanced on the points of the stem, so as to insure a free movement of these parts. The yoke D might be dispensed with and the weights applied directly on the end of the loose stem D; but this mode would have a tendency to tip the stem out of a true vertical plane and bind on the sides.

It is obvious that the adjustable weighting may be accomplished in various ways, the object being to retain the stem in a position to have a positive central bearing in the center of the valve-piston.

The tube b, (see Fig. 4,) arranged on the inside of the lower end of the cylinder, and exten ling upward for a way on the inside of the tubular piston, is to serve the purpose of increasing the condensing-surface, should it be noessary so to d9); but ordinarily the arrangement heretofore? described will be sufficient.

to any desired limit in accordance with the fisstead ef the double-seatedbalance wing-.

weight placed on the loose stein D. The steam or liquid pressure forcing the piston upward, and the weighted stem performing the same function in the opposite direction, thus regulating the movement of the valve proper, and increasing or diminishing the opening through the same as the pressure varies.

valve D shown in Fig. 2, a plain cylindrical tubular valve, E, (see Fig. 8,) provided with one or more apertures, may be used.

The construction shown in Figs. 5, 7, and 8 relates more especially to a change in the manner and means for weighting the loose stem D and the piston. In this case the lever F is provided with the adjustable weight d, and near the inner end is formed with a ring or collar encircling the steam-cylinder, for the purpose of securing said lever a central position. The ring F, inolosing the cylinder below the lever, is provided with the lug prolongation d, to which the end of the lever F is pivoted. The lower vertical ends of the yoke D are in this case pivoted to the circular or collar part 01 of the lever F, and form the required fulcrum for the same. The same result is obtained from this mode of weighting the valve as that already described.

Having thus described my invention, what I claim, and desire to secure by Letters Patent,

1., In apressure-reducing valve, the combination, with a tubular piston provided exteriorly with a number of annular grooves or water-pockets and interiorly with a diaphragm, of the means described, whereby the product of condensation is allowed to gradually escape from said piston so as-to constantly maintain a tight joint, substantially as and for the pur pose set forth. r

2. In a pressure reducing valve, the combination, with a tubular piston having waterpacking pockets and a diaphragm, as described, of a double-seated balance-valve, and a connecting-link pivoted to said piston and valve, whereby said parts are adapted to have a free lateral adjustment independent of each oth er, substantially as and for the purpose set forth.

3. The combination, with a valve-chamber, of a regulating cut-off valve inserted in the inlet-passage leading to said chamber. a steamcylinder communicating with said chamber, a tubular piston provided with water-packing pockets and an interiorly arranged diaphragm, a link connecting said eut-ofi" valve and piston, a stem having a loose connection with said piston, and the weighted yoke, mounted on the projecting end of said stem, whereby the cut-ofi' valve is adapted to have an automatic adjustment to reduce the pressureand maintain the same at any desired limit in the outlet-passage, no matter what the pressure may be in the supply-inlet.

4. In areducing-valve, the combination, with a steam-cylinder having the up er end closed with a hollow cap, of a tubular, piston provided with water pockets and a diaphragm, a drop-tube inserted in said cap and extending down on the inside of said piston, and a drippipe leading from said cap, whereby the productsv of condensation are allowed to gradually escape, substantially as and forthe purpose set forth.

5. In a pressure reducing valve, the combination, with a tubular piston provided with water-pockets and a diaphragm, of a double seated cut-off valve, a link forminga pivotal connection between said piston and valve, and a loosely inserted and weighted stem adapted to move said piston and valve in a direction opposite to that of the steam-pressure, substantially as and for the purpose set forth.

6. In a pressure-reducing valve, the combi-' nation, with a steam-cylinder, of the cap B,

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the tubular piston C, the tube b, and means for carrying off the product of condensation from said cylinder, substantially as and for the purpose set forth.

GEORGEM. DAVIS.

Witnesses:

CHAS. H. RANSOM, L. B. COUPLAND. 

